v2.4.0.6
Fair Values of Assets and Liabilities Textuals (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Securities available for sale $ 235,199,000,000 $ 222,613,000,000      
Net unrealized gains on trading securities 305,000,000 133,000,000      
Mortgages held for sale 42,305,000,000 44,791,000,000      
Loans 799,574,000,000 769,631,000,000 757,267,000,000 782,770,000,000 864,830,000,000
Capital Lease Obligation 12,000,000 116,000,000      
Loan charge-offs 10,973,000,000 13,615,000,000 20,100,000,000 19,825,000,000 8,777,000,000
US States and Political Subdivisions [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Fair Value Disclosure, Transfers from Level 3 to Level 2 9,400,000,000        
Trading Account Assets Other [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Fair Value Disclosure, Transfers from Level 2 to Level 1   709,000,000      
Private Equity Funds [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Liquidation period 8 years        
Venture Capital Funds [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Liquidation period 5 years        
Private Equity Funds, Foreign [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Redemption restriction for investment 189,000,000 200,000,000      
Lease Financing [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Loans 12,424,000,000 13,117,000,000 13,094,000,000 14,210,000,000 15,829,000,000
Loan charge-offs 24,000,000 38,000,000 120,000,000 229,000,000 65,000,000
Non modified loans [Member] | Maximum [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Cost to service per loan 437        
Non modified loans [Member] | Minimum [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Cost to service per loan 90        
Residential [Member] | Government Insured Or Guaranteed [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Mortgages held for sale 942,000,000        
Residential [Member] | Non Government Insured Or Guaranteed [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Mortgages held for sale 103,000,000        
Consumer [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Loans 438,376,000,000 424,181,000,000 435,209,000,000 446,305,000,000 474,866,000,000
Loan charge-offs 8,959,000,000 10,819,000,000 14,667,000,000 14,261,000,000 6,607,000,000
Consumer [Member] | Loans discharged in bankruptcy [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Loan charge-offs 888,000,000        
Financing Receivable, Fair Value, Nonaccrual Status 2,000,000,000        
Collateralized loan obligations [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Total trading assets (excluding derivatives) 721,000,000 583,000,000      
Securities available for sale 12,500,000,000 8,100,000,000      
Trading and available for sale securities 13,300,000,000        
Available for sale Securities [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Fair Value Disclosure, Transfers from Level 3 to Level 2     4,900,000,000    
Fair Value Disclosure, Transfers from Level 2 to Level 3   502,000,000      
Significant Transfers Into Level 3, Amount     829,000,000    
Significant Transfers Out of Level 3, Amount     1,900,000,000    
Available for sale Securities [Member] | Debt Securities [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Fair Value Disclosure, Transfers from Level 3 to Level 2   801,000,000      
Fair Value Disclosure, Transfers from Level 2 to Level 3     1,700,000,000    
Trading Securities [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Significant Transfers Out of Level 3, Amount     276,000,000    
Mortgage servicing rights [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Significant Transfers Out of Level 3, Amount     118,000,000    
Long-term debt [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Significant Transfers Into Level 3, Amount     359,000,000    
Loans [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Significant Transfers Into Level 3, Amount     366,000,000    
Carrying amount [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Loan Commitments And Standby, Commercial And Similar Letters of Credit 586,000,000 495,000,000      
Estimated fair value [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Loans 772,351,000,000 723,867,000,000      
Loan Commitments And Standby, Commercial And Similar Letters of Credit 586,000,000 495,000,000      
Estimated fair value [Member] | Level 1 [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Loans 0        
Estimated fair value [Member] | Level 2 [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Loans 56,237,000,000        
Estimated fair value [Member] | Level 3 [Member]
         
Fair Values of Assets and Liabilities (Textual) [Abstract]          
Loans $ 716,114,000,000